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首页> 外文期刊>Environmental Science & Technology >New Insights into Black Carbon Nanoparticle-lnduced Dispersibility of Goethite Colloids and Configuration-Dependent Sorption for Phenanthrene
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New Insights into Black Carbon Nanoparticle-lnduced Dispersibility of Goethite Colloids and Configuration-Dependent Sorption for Phenanthrene

机译：黑碳纳米粒子诱导针铁矿胶体的分散性和菲的构型依赖性吸附的新见解

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摘要

Black carbon nanoparticles (nano-BC) are one of the most active components in pyrogenic carbonaceous matter and involved in many biogeochemical processes. This study investigated heteroaggregation of nano BC with goethite (a model of natural mineral colloids) and the configuration effect of heteroaggregates on phenanthrene (PHE) sorption. Nano-BC could significantly enhance the dispersion of goethite via heteroaggregation when its concentration was higher than the critical concentration (Cc). The Cc was dependent on the surface potential of nano-BC, which was directly measured for the first time in this study. Configuration and stability of the heteroaggregates were regulated by BC-goethite mass ratio and solution pH. At pH 5.3, oppositely charged goethite and nano-BC interacted with each other through electrostatic attraction and the configuration of heteroaggregates was dependent on BC-goethite mass ratio. At pH 7.4, where both goethite and nano-BC were negatively charged, they heteroaggregated with each other mainly through H-bonding and Lewis acid base mechanisms, and the configuration of heteroaggregates was independent of BC-goethite mass ratio. For PHE sorption, small-sized heteroaggregates were more favorable than large ones due to the higher content of active sorption sites. Interestingly, at a higher concentration of PHE, we found that the solute molecules could probably penetrate into and/or alter the configuration of heteroaggregates and enhance its sorption capacity for PHE. These findings are useful for understanding the effect of nano-BC on colloidal stability and organic compound sorption of minerals.
机译：黑碳纳米颗粒（nano-BC）是热解碳质物质中活性最高的成分之一，并参与许多生物地球化学过程。这项研究调查了针铁矿（天然矿物胶体的模型）与纳米BC的异质聚集以及杂质聚集对菲（PHE）吸附的构型影响。当其浓度高于临界浓度（Cc）时，纳米BC可以通过杂聚体显着提高针铁矿的分散性。 Cc取决于纳米BC的表面电势，这是本研究中首次直接测量。杂集料的构型和稳定性受BC-针铁矿质量比和溶液pH值的调节。在pH 5.3时，带相反电荷的针铁矿和纳米BC通过静电吸引相互相互作用，杂聚集体的构型取决于BC-针铁矿的质量比。在pH 7.4时，针铁矿和纳米BC均带负电，它们主要通过H键和Lewis酸碱机理彼此杂聚，且杂聚物的构型与BC-针铁矿质量比无关。对于PHE吸附，由于活性吸附位点的含量较高，因此小尺寸的杂集料比大的杂集料更有利。有趣的是，在较高的PHE浓度下，我们发现溶质分子可能会渗入和/或改变杂聚集体的构型，并增强其对PHE的吸附能力。这些发现对于理解纳米BC对矿物质的胶体稳定性和有机化合物吸附的作用是有用的。

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  • 来源
    《Environmental Science & Technology》 |2019年第2期|661-670|共10页
  • 作者

    Lian Fei; Yu Wenchao; Wang Zhenyu; Xing Baoshan;

  • 作者单位

    Jiangnan Univ, Inst Environm Proc & Pollut Control, Wuxi 214122, Peoples R China|Jiangnan Univ, Sch Environm & Civil Engn, Wuxi 214122, Peoples R China|Univ Massachusetts, Stockbridge Sch Agr, Amherst, MA 01003 USA;

    Nankai Univ, Coll Environm Sci & Engn, Tianjin 300071, Peoples R China;

    Jiangnan Univ, Inst Environm Proc & Pollut Control, Wuxi 214122, Peoples R China|Jiangnan Univ, Sch Environm & Civil Engn, Wuxi 214122, Peoples R China;

    Univ Massachusetts, Stockbridge Sch Agr, Amherst, MA 01003 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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